Elering AS (former name: OÜ Põhivõrk) is a national transmission system operator for electricity and natural gas with headquarters in Tallinn, Estonia.

[2] Elering was established on 1 November 1998 under the name of Põhivõrk as an operating unit of the Estonian national power company Eesti Energia.

To implement the EU 3rd energy package, the Government of Estonia decided on 28 August 2009 to go for an ownership unbundling and to buy out Elering from Eesti Energia.

[11] On 24 May 2019, Elering along with Latvian and Lithuanian transmission system operators Augstsprieguma tīkls and Litgrid signed an agreement to join the synchronous electricity grid of Continental Europe.

Together with Finnish state-owned company Baltic Connector OY, Elering is developing the undersea gas pipeline Balticconnector between Estonia and Finland.